US5032974A - Three-phase alternating current circuit configuration, for using a power supply for the synchronized timing for an electrical apparatus - Google Patents

Three-phase alternating current circuit configuration, for using a power supply for the synchronized timing for an electrical apparatus Download PDF

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Publication number
US5032974A
US5032974A US07/444,690 US44469089A US5032974A US 5032974 A US5032974 A US 5032974A US 44469089 A US44469089 A US 44469089A US 5032974 A US5032974 A US 5032974A
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phase
pulse generator
control voltage
circuit configuration
resistors
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US07/444,690
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English (en)
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Wolfgang Dohmstreich
Guenter Steinmueller
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Siemens AG
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Siemens AG
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor

Definitions

  • the invention relates to a three-phase circuit configuration for synchronizing the timing of an electrical apparatus and more particularly to a three-phase circuit configuration where the three phase power supply is used to produce the timing signal for an electrical apparatus.
  • An example of the type of apparatus to which the present invention relates is an electricity rate meter, as described in German patent No. 24 46 602.
  • An electricity rate meter is used for the continuous recording and display of the electrical energy consumption. These electrical energy consumption values are averaged over constant time intervals.
  • Such apparatus is frequently operated with three-phase power supplied by a three-phase power supply unit.
  • pulses are generated according to the measured electrical power, and these pulses are stored for a specified period of time. The pulses are calculated from the integral of the measured electrical power versus time and are thus a measure of the consumed electrical energy drawn from the power supply. Pulses of constant frequency, which are derived from the frequency of the power supply, are needed as a time base.
  • Peak demand detectors also have a similar method of operation as described in German Patent No. 26 05 803. As with rate meters, peak demand detectors are supplied from an assigned power system and derive clock pulses for their time basis from this power supply.
  • An a.c. control voltage suitable for the formation of pulses can be derived from a three-phase power supply.
  • an a.c. control voltage is usually obtained from a phase voltage, that is, from the voltage between a phase line and the neutral line.
  • a line to line voltage serves this purpose.
  • clock pulses need to be continuously generated as long as the apparatus remains in operation with a sufficient power supply.
  • the wires are coupled to three large star connected resistors having different resistance values. These resistors are coupled to the phase conductors of the three-phase power supply and are also coupled together to form an electrically asymmetrical neutral point opposite the neutral line. If the three-phase power supply has a three wire connection, the leads of the three-phase power supply are coupled to two sets of three star coupled resistors having different resistance values. The ends of each set of resistors are coupled together to form two neutral points which are electrically asymmetrical to each other because of the selection of resistors having different resistance values of the assigned resistors.
  • the clock pulses are formed from the a.c. control voltage arising between the neutral point and the neutral line.
  • the clock pulses are formed from the a.c. control voltage arising between the first and second neutral points.
  • a Schmitt trigger can be used to generate pulses from the alternating current control voltage.
  • the pulse generator contains an optical coupler that electrically isolates the electrical apparatus from the power system.
  • FIG. 1 is a block diagram of the circuit configuration in a four-wire configuration according to an embodiment of the invention
  • FIG. 2 is a block diagram of the circuit configuration in a three-wire configuration according to an embodiment of the invention
  • FIG. 3 is a circuit diagram of a device for the extraction of clock pulses from a four-wire configuration according to an embodiment of the invention
  • FIG. 4 is a circuit diagram of a device for the extraction of clock pulses from a four-wire configuration with simultaneous electrical isolation according to an embodiment of the invention.
  • FIG. 5 is a circuit diagram of a device for the extraction of clock pulses from a four-wire configuration with signal conversion according to an embodiment of the invention.
  • phase connections L1, L2 and L3 and the neutral line N of a four-wire, three-phase power supply are shown.
  • the phase leads L1, L2, and L3 are coupled to a common neutral point S1 across respective resistors R 1 , R 2 , and R 3 , having different resistance values (asymmetrical resistors).
  • the voltage between this neutral point S1 and the neutral line is an a.c. control voltage U ST which is supplied to a pulse-forming stage P.
  • the amplitude of the a.c. control voltage U ST depends on the differential values of the resistors R 1 , R 2 , and R 3 .
  • the pulse-forming stage P converts this a.c. control voltage U ST to a pulse sequence U P .
  • the pulse sequence U P is fed to the electrical apparatus M as a time base.
  • the electrical apparatus M can be a peak demand detector, for example.
  • the electrical d.c. voltage required for supplying the pulse-forming stage P and the electrical apparatus M is obtained from the three-phase power supply L1, L2 L3 by rectifying the phase voltages in a three-phase rectifier G.
  • the tapping of the a.c. control voltage U ST between the neutral point S1, which is coupled to the asymmetrical resistors R 1 , R 2 , and R 3 , and the neutral line N has the advantage that the a.c. control voltage U ST is continuously produced even when one or two phases of the three-phase power supply have failed.
  • the d.c. supply voltage obtained from all three phases The d.c. supply voltage is continuously produced so that the electrical apparatus M still continues to operate even when individual phases fail. If the three-phase power supply undergoes a complete failure, the apparatus is no longer able to function.
  • FIG. 2 a variation of the circuit configuration of FIG. 1 is shown.
  • This circuit configuration can be used in a three-phase circuit with a three-wire connection, i.e., without a neutral line.
  • the resistors R 11 , R 21 , and R 31 are coupled to the neutral point S2 and the resistors R 12 , R 22 , and R 32 are coupled to the neutral point S3.
  • the control voltage U ST is the resulting voltage between the two neutral points S2 and S3.
  • the control voltage U ST is present whenever one neutral point is asymmetrical in relation to the other.
  • One neutral point is asymmetrical in relation to the other whenever the resistors that are coupled to a particular neutral point have different values or whenever corresponding resistors coupled to form both neutral points have different values.
  • the control voltage U ST resulting in this manner is further processed in the configuration described referring to FIG. 1.
  • the control voltage U ST is coupled to a half-wave rectifier D, which produces a half-wave voltage signal.
  • This half-wave voltage signal is fed to the base of a switching transistor T, whose collector lead is coupled across a resistor R C to the positive power supply voltage of the apparatus.
  • Clock pulses arise across the load resistor R C of the switching transistor corresponding to the appearance half-wave voltage signals across the half-wave rectifier D.
  • FIG. 4 another design for the switching circuitry of the pulse forming stage P is shown.
  • the switching transistor T is replaced by an optical coupler O.
  • the optical coupler electrically isolates the pulse-forming stage from the three-phase power supply.
  • a Schmitt trigger ST takes the place of the pulse-forming stage P shown in the switching configurations of FIGS. 3 and 4. These switching variations can be applied so that the clock pulses exhibit a specified form, for example to filter out interference pulses.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Power Conversion In General (AREA)
  • Manipulation Of Pulses (AREA)
  • Rectifiers (AREA)
US07/444,690 1988-12-15 1989-12-01 Three-phase alternating current circuit configuration, for using a power supply for the synchronized timing for an electrical apparatus Expired - Lifetime US5032974A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP88121012.4 1988-12-15
EP88121012A EP0373248B1 (de) 1988-12-15 1988-12-15 Drehstrom-Schaltungsanordnung für die netzsynchrone Zeitsteuerung eines elektrischen Gerätes

Publications (1)

Publication Number Publication Date
US5032974A true US5032974A (en) 1991-07-16

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US07/444,690 Expired - Lifetime US5032974A (en) 1988-12-15 1989-12-01 Three-phase alternating current circuit configuration, for using a power supply for the synchronized timing for an electrical apparatus

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US (1) US5032974A (de)
EP (1) EP0373248B1 (de)
AT (1) ATE90458T1 (de)
DE (1) DE3881699D1 (de)
ES (1) ES2043774T3 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050281067A1 (en) * 2004-06-21 2005-12-22 Ballard Power Systems Corporation System and method for unbalanced independent AC phase voltage control of a 3-phase, 4-wire output DC/AC inverter
CN101887082A (zh) * 2010-06-25 2010-11-17 苏州能健电气有限公司 三相电源输入缺相检测电路

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59100167D1 (de) * 1991-10-28 1993-07-29 Siemens Ag Schaltung zur netztakterzeugung.

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA668811A (en) * 1963-08-20 The General Engineering Company Ltd. Single phase power supply system having a multiphase source
DE2446602A1 (de) * 1974-09-30 1976-04-01 Siemens Ag Messeinrichtung fuer ueber eine gleitende zeitspanne gebildete integralwerte
US3968418A (en) * 1974-01-07 1976-07-06 Allmanna Svenska Elektriska Aktiebolaget Convertor connection with asymmetry indicating means
DE2605803A1 (de) * 1976-02-12 1977-08-18 Heliowatt Werke Elektronischer maximumwaechter
US4081746A (en) * 1975-11-06 1978-03-28 Westinghouse Electric Corporation Multiple rate meter
DE2834881A1 (de) * 1978-08-07 1980-02-21 Heliowatt Werke Verfahren zur ableitung von taktsignalen
US4791546A (en) * 1987-12-23 1988-12-13 Dci Technology Voltage regulator circuit
DE3719439A1 (de) * 1987-06-11 1988-12-22 Helmuth Dr Frenk Frequenz-mess-verfahren fuer digital-tachometer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU464218B2 (en) * 1972-06-05 1975-08-21 Triton Engineering Pty. Ltd Improved electrical erlang meter

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA668811A (en) * 1963-08-20 The General Engineering Company Ltd. Single phase power supply system having a multiphase source
US3968418A (en) * 1974-01-07 1976-07-06 Allmanna Svenska Elektriska Aktiebolaget Convertor connection with asymmetry indicating means
DE2446602A1 (de) * 1974-09-30 1976-04-01 Siemens Ag Messeinrichtung fuer ueber eine gleitende zeitspanne gebildete integralwerte
US4081746A (en) * 1975-11-06 1978-03-28 Westinghouse Electric Corporation Multiple rate meter
DE2605803A1 (de) * 1976-02-12 1977-08-18 Heliowatt Werke Elektronischer maximumwaechter
DE2834881A1 (de) * 1978-08-07 1980-02-21 Heliowatt Werke Verfahren zur ableitung von taktsignalen
DE3719439A1 (de) * 1987-06-11 1988-12-22 Helmuth Dr Frenk Frequenz-mess-verfahren fuer digital-tachometer
US4791546A (en) * 1987-12-23 1988-12-13 Dci Technology Voltage regulator circuit

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
Funkschau, vol. 16, 1985, pp. 53 54, Francis Verlag, Muenchen, Grundschaltungen der Elektronik, Optokoppler, G8, Teil 1 . *
Funkschau, vol. 16, 1985, pp. 53-54, Francis Verlag, Muenchen, "Grundschaltungen der Elektronik, Optokoppler, G8, Teil 1".
General Electric Company, Transistor Manual, 8/64 pp. 178 179. *
General Electric Company, Transistor Manual, 8/64 pp. 178-179.

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050281067A1 (en) * 2004-06-21 2005-12-22 Ballard Power Systems Corporation System and method for unbalanced independent AC phase voltage control of a 3-phase, 4-wire output DC/AC inverter
US7177165B2 (en) * 2004-06-21 2007-02-13 Ballard Power Systems Corporation System and method for unbalanced independent AC phase voltage control of a 3-phase, 4-wire output DC/AC inverter
CN101887082A (zh) * 2010-06-25 2010-11-17 苏州能健电气有限公司 三相电源输入缺相检测电路
CN101887082B (zh) * 2010-06-25 2012-08-29 苏州能健电气有限公司 三相电源输入缺相检测电路

Also Published As

Publication number Publication date
ES2043774T3 (es) 1994-01-01
EP0373248A1 (de) 1990-06-20
EP0373248B1 (de) 1993-06-09
DE3881699D1 (de) 1993-07-15
ATE90458T1 (de) 1993-06-15

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